I'd also request testing on multi-monitor setups. When plugging my MBP into an external display, sometimes flux transitions to the external monitor, sometimes it doesn't.
I have a color profiled MBP and also see unreliable transitions now and again. Opening System Preferences > Displays > Color and flipping two profiles back and forth fixes it.
A feature request: some way for me to get rid of the f.lux menu-bar icon without quitting f.lux.
(I am willing to switch to an app or a preference pane to interact with f.lux.)